Two new species of Hyalonema (Hexactinellida, Amphidiscosida, Hyalonematidae) from the Indo-West Pacific

By

Gong, Lin
Setiawan, Edwin
Li, Xinzheng
Lim, Swee Cheng

Type

Article

Date of Publication

2025-12-3

Original Publication

ZooKeys

Volume

1262

Pages

81--96

Subjects

deep sea , glass sponge , Hyalonema (Cyliconema) dexiangi sp. nov. , Hyalonema (Cyliconema) subconica sp. nov. , new species , Phylogeny , taxonomy

Contributed by

Pensoft Publishers

Language

English

Published by

Sofia, Bulgaria Pensoft Publishers

Identifiers

DOI: https://doi.org/10.3897/zookeys.1262.164821

 

Abstract

<br> This study describes two new species collected from deep-sea environments in the Indo-West Pacific. Hyalonema (Cyliconema) dexiangi<br> sp. nov.<br> , collected from the Indian Ocean, is characterized by distinctive finger-like protuberances on the body surface, the presence of choanosomal pentactins, the co-occurrence of micropentactins and microhexactins, and the absence of mesamphidiscs. Hyalonema (Cyliconema) subconica<br> sp. nov.<br> , sampled from a seamount in the western Pacific Ocean, is distinguished by the presence of pinular diactins, a unique combination of choanosomal spicules (diactins, pentactins, and hexactins), and the presence of basalia bearing two-toothed anchors. In addition to their morphological distinctions, molecular phylogenetic analyses based on 16S rDNA sequences indicate a close genetic relationship between the two species.<br>